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https://issues.apache.org/jira/browse/HAMA-668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommaso Teofili resolved HAMA-668.
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Resolution: Fixed
Fix Version/s: 0.6.0
Assignee: Tommaso Teofili
> Fix possible number instabilities in LogisticRegression CF
> ----------------------------------------------------------
>
> Key: HAMA-668
> URL: https://issues.apache.org/jira/browse/HAMA-668
> Project: Hama
> Issue Type: Bug
> Components: machine learning
> Reporter: Tommaso Teofili
> Assignee: Tommaso Teofili
> Fix For: 0.6.0
>
>
> In calculateCostForItem the log of several calculations may run in the
> special cases of the logarithm:
> * If the argument is NaN or less than zero, then the result is NaN.
> * If the argument is positive infinity, then the result is positive infinity.
> * If the argument is positive zero or negative zero, then the result is
> negative infinity.
> We should guard them.
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